Painless abrasive stone for grinding teeth



Patented Nov. 3, 1931 UNITED STATES PATENT OFFICE HARRY DRESPEL, or BROOKLYN, New YORK PAINLESS ABRASTVE STONE FOR GRINDING TEETH N Drawing.

sion of an article of the class mentioned which is efficient in action, and which can be manufactured and sold at a low cost and which contains nothing of an injurious or i deleterious nature.

which the various novel features of the invention are more particularly set forth.

The invention proposes the use of an anaesthetic distributed partially or entirely throughout the texture of an abrasive dental stone for neutralizing and relieving pain caused by the heat produced by the usual friction when grinding is done upon a patien-ts teeth. The abrasive stone may be natural or artificial and the anaesthetic may be any whatsoever. In the event that the anaesthetic is liquid the stone is saturated therewith and in the event that it is a solid, it is produced in powdered form and then formed into the texture of the stone during the forming of the stone.

The invention consists in the use of an abrasive stone made of minute particles, anaesthetic in powdered form and cementing material for holding the abrasive stone and the anaesthetic together to form a grinding stone. The grinding stone may be of disc, conical or cylindrical shape as is desired, or in the form of separating discs, where the abrasive may be used on one or both sides. 'The abrasive may also be in the form of sand paper or the like of any suitable shape, the texture of which is treated or formed with suitable anaesthetic.

Preferably, the quantity of anaesthetic used should be from 1,5 to 5% and may be such Application filed Jan-nary 17, 1929. Serial No. 333,240.

anaesthetics as orthform cocaine hydrochloride, morphine acetate, novocain, etc. These various anaesthetics are of solid form or powdered. In the event that a liquid anaesthetic is to be used such as europhen, phenol, or menthol, the stone may be placed in these liquid anaesthetics and allowed to remain until saturated. The saturation may be complete, that is, completely thru the grinding stone or it may simply be for a small distance 4 within its surface. The amount of saturation of course is determined by the length oftime in which the stone is permitted to remain within the liquid anaesthetic.

It is pointed out that a grinding stone of this character when used upon a patients teeth nullifies and-relieves the pain caused by grinding since the anaesthetic is deposited upon the surface being ground during the grinding thereof. This stone is of particular advantage in cases where patients have very sensitive teeth in which even the slightest grinding causes pain. The action of the anaesthetic serves to relieve such pain.

While I have described my invention with some degree of particularity, I realize that in practice various alterations therein may be made. I thereforev reserve the right and privilege of changing the form of the details or otherwise altering the arrangement of the correlated part-s without departing from the spirit or the scope of the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is 1. An abrasive stone for use by dentists in the grinding of patients teeth, comprising an abrasive stone with an anaesthetic mixed throughout its structure and to form a part thereof in the manner described so that during the grinding of teeth, the pain, which is caused by the heat produced by the usual friction, be neutralized and relieved.

2. An abrasive stone for use by dentists in grinding patients teeth, comprising an a so i artificial grinding stone with an anaesthetic formed throughout its texture.

3. An abrasive stone for use by dentists in grinding patients teeth, comprising an artificial grinding stone with an anaesthetic formed throughout its teXture, said anaesthetic being in powdered form and combined in the manner described.

4. An abrasive surface for use by dentists in grinding patients teeth, comprising an artificial grinding surface with an anaesthetic formed throughout its texture.

In testimony whereof I have affixed my signature.

HARRY DRESPEL. 

